20612560 has 20 divisors (see below), whose sum is σ = 47924388. Its totient is φ = 8244992.

The previous prime is 20612539. The next prime is 20612561. The reversal of 20612560 is 6521602.

It can be written as a sum of positive squares in 2 ways, for example, as 2702736 + 17909824 = 1644^2 + 4232^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20612561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128749 + ... + 128908.

Almost surely, 2^20612560 is an apocalyptic number.

20612560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20612560 is an abundant number, since it is smaller than the sum of its proper divisors (27311828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20612560 is a wasteful number, since it uses less digits than its factorization.

20612560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257670 (or 257664 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 20612560 is about 4540.1057256412. The cubic root of 20612560 is about 274.1851803764.

The spelling of 20612560 in words is "twenty million, six hundred twelve thousand, five hundred sixty".